You might want to spend some time browsing the exhibits at Bunker Museum, B-413 Submarine Museum, or Museum of the World Ocean. Some landmarks that you won't want to miss include Ruins of Koenigsberg castle, Honey Bridge, and Amber Museum. You can catch a show at Kaliningrad Regional Drama Theatre, Kaliningrad Regional Youth Theater for Young Spectators, and Kaliningrad Regional Philharmonic Hall.